http://wiki.openstreetmap.org/wiki/Proposed_features/Surface_Mining
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RP:
http://wiki.openstreetmap.org/wiki/Proposed_features/Mining
http://wiki.openstreetmap.org/wiki/Tag:landuse%3Dquarry
this is a bit of a mess. i think we use quarry for now, regardless of it's crapness, as it's accepted. we can change it later if the tags are updated
also, i would use resource=pumice, for the same reason
http://wiki.openstreetmap.org/wiki/Key:resource
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